Brocade Network OS Administrator’s Guide v4.1.1 - Manual (Page 357)

• The VLAN filtering behavior on logical Layer 2 interfaces such as LAG interfaces is the same as on
port interfaces.
• The VLAN filtering database (FDB) determines the forwarding of an incoming frame.
Additionally, there are important facts you should know about the VLAN FDB:
• The VLAN FDB contains information that helps determine the forwarding of an arriving frame based
on MAC address and VLAN ID data. The FDB contains both statically configured data and dynamic
data that is learned by the switch.
• The dynamic updating of FDB entries using learning is supported (if the port state permits).
• Dynamic FDB entries are not created for multicast group addresses.
• Dynamic FDB entries are aged out based on the aging time configured per Brocade VDX hardware.
The aging time is between 60 and 1000000 seconds. The default is 300 seconds.
• You can add static MAC address entries specifying a VLAN ID. Static entries are not aged out.
• A static FDB entry overwrites an existing dynamically learned FDB entry and disables learning of the
entry going forward.
NOTE
For more information on frame handling for Brocade VDX hardware, refer to
FCoE and Layer 2 Ethernet
on page 340.
VLAN configuration guidelines and restrictions
Follow these guidelines and restrictions when configuring VLANs:
• On all Brocade VDX switches, VLAN 1002 is reserved for FCoE VLAN functionality.
• On Brocade VDX 8770 switches: 1 through 4086 for 802.1Q VLANs (VLAN IDs 4087 through 4095
are reserved on these switches), and 4096 through 8191 for service or transport VFs in a Virtual
Fabrics context.
• On all other Brocade VDX switches: 1 through 3962 for 802.1Q VLANs (VLAN IDs 3963 through
4095 are reserved on these switches), and 4096 through 8191 for service or transport VFs in a
Virtual Fabrics context.
• In an active topology, MAC addresses can be learned, per VLAN, using Independent VLAN Learning
(IVL) only.
• A MAC address ACL always overrides a static MAC address entry. In this case, the MAC address is
the forwarding address and the forwarding entry can be overwritten by the ACL.
• The Brocade DCB switch supports Ethernet DIX frames and 802.2 LLC SNAP encapsulated frames
only.
• You must configure the same native VLAN on both ends of an 802.1q trunk link. Failure to do so can
cause bridging loops and VLAN leaks.
• All switches in a fabric cluster or logical chassis cluster must be configured with the same VLAN
number.
Configuring and managing 802.1Q VLANs
Understanding the default VLAN configuration
The following table summarizes the default VLAN configuration. Consider this when making
configuration changes.
VLAN configuration guidelines and restrictions
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